Tutorials in Introductory Physics
1st Edition
ISBN: 9780130970695
Author: Peter S. Shaffer, Lillian C. McDermott
Publisher: Addison Wesley
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Textbook Question
Chapter 2.1, Problem 2bT
A second book of greater mass is placed on top of the first.
Sketch a free-body diagram for each of the book in the space below. Label all the forces as in part A.
Specify which of the forces are contact forces and which are non-contact.
1. Examine all the forces on the two free-body diagram you just drew. Explain why a force that appears on one diagram should not appear on the other diagram.
2. What type of force does the upper exert on the lower book (e.g., frictional, gravitational)?
Why would it be incorrect to say that the weight of the upper book acts on the lower book?
3. What observation can you make that allows you to determine the relative magnitudes of the forces on the upper book?
4. Are there any forces acting on the lower book that have the same magnitude as a force acting on the upper book? Explain.
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Free Body Diagrams
1. Draw a free body diagram to represent all of the forces acting on a book that is at rest on a table.
2. What are the features of a good free body diagram? What is the best way to represent the interaction itself?
Why is the length of each vector important?
3. How should the length of the arrows representing each force compare for the book on the table? Why?
4. Let's place a second book on top of the book on the table. Draw a free body diagram for each book. Which
forces are of equal magnitude?
5. None of the forces on the diagram of the first book should show up on the diagram of the second book and
vice versa. Why is this?
6. What type of force does the top book apply on the bottom book? Why would it be inaccurate to say that the
weight of the top book acts on the bottom one?
7. How does the free body diagram of the lower book compare to the free body diagram you drew in question 1?
Which forces changed and which stayed the same?
SOLVE THE FOLLOWING PROBLEM AND SHOW YOUR COMPLETE SOLUTIONS. EXPLAIN YOUR ANSWERS FOR BETTER UNDERSTANDING. ILLUSTRATE FREE BODY DIAGRAM.
The block shown in figure #1 above has a mass of 4.30 kg. The applied force (? ⃑ ) has a magnitude of 31.2 N and is 32.0° above the horizontal, frictionless surface the block in on.
a. Draw the free-body diagram for the block.
b. Set-up Newton’s 2nd Law for the block.
Chapter 2 Solutions
Tutorials in Introductory Physics
Ch. 2.1 - Draw a large dot on your large sheet of paper to...Ch. 2.1 - Describe the remaining forces you have indicated...Ch. 2.1 - All forces arise from interactions between...Ch. 2.1 - There are many different types of forces,...Ch. 2.1 - Consider the following discussion between two...Ch. 2.1 - Label each of the forces on your free-body diagram...Ch. 2.1 - Sketch a free-body diagram for a book at rest on a...Ch. 2.1 - A second book of greater mass is placed on top of...Ch. 2.1 - Compare the free-body diagram for the lower book...Ch. 2.1 - Which, if any, Newton’s third law force pairs are...
Ch. 2.1 - A magnet is supported by another magnet as shown...Ch. 2.1 - An iron rod is held up by a magnet as shown. The...Ch. 2.2 - Compare the net force (magnitude and direction) on...Ch. 2.2 - Draw separate free-body diagrams for system A and...Ch. 2.2 - Is the magnitude of the force exerted on system A...Ch. 2.2 - D. Identify all the Newton's third law...Ch. 2.2 - Rank the magnitudes of the horizontal forces that...Ch. 2.2 - Suppose the mass of each brick is 2.5 kg, the...Ch. 2.2 - Describe the motions of systems A and B. How does...Ch. 2.2 - Compare the net force (magnitude and direction) on...Ch. 2.2 - Draw and label separate free-body diagrams for...Ch. 2.2 - Consider the following discussion between two...Ch. 2.2 - Rank the magnitudes of all the horizontal forces...Ch. 2.2 - Compare the magnitude of the netforce on system C...Ch. 2.2 - Draw and label a free-body diagram for system C....Ch. 2.2 - At right is a free-body diagram for a cart. All...Ch. 2.3 - Describe the motions of block A, block B, and the...Ch. 2.3 - On a large sheet of paper, draw a separate...Ch. 2.3 - Identify all the Newton's third law...Ch. 2.3 - Rank, from largest to smallest, the magnitudes of...Ch. 2.3 - Consider the horizontal components of the forces...Ch. 2.3 - If the motion of the blocks is the same as in...Ch. 2.3 - Suppose the mass of the string that connects...Ch. 2.3 - A string exerts a force on each of the two objects...Ch. 2.3 - If you know that the net force on a massless...Ch. 2.3 - Predict the subsequent motions of objects A and B...Ch. 2.3 - Draw separate free-body diagrams for objects A and...Ch. 2.3 - Predict: • what will happen to object C when it is...Ch. 2.3 - Draw and label separate free-body diagrams for...Ch. 2.3 - The weight of a 200 g mass has magnitude...Ch. 2.3 - Consider the following statement about the...
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